Malicious PDF — malware analysis report

Static analysis result for SHA-256 27b5d2e9ab8d58e3…

MALICIOUS

PDF

95.4 KB Created: 2021-07-01 18:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7d64b33ed7c2c71f699b6905b6518b82 SHA-1: 36c4c922a3b830143844ccd685fd204748d73648 SHA-256: 27b5d2e9ab8d58e3790c83efaab030aedaf530a1f95ee334b9ef9c1d3484d050
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to PDF files hosted on compromised WordPress sites. The presence of these links suggests an attempt to distribute further malicious content or conduct phishing operations. No scripts were extracted, but the structure indicates a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f676f89747---13780458859.pdf In PDF document text
    • http://www.lugashotel.com/data/editorfile/giximiwan.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/pj5gct8mi594mhd2f46v5pkb3i/51864982664.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/41978543660.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc1b7e2bec---gituged.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4fdf11e2ea---ponasuzugi.pdfIn PDF document text
    • http://guitarenko.fr/img/files/5335301510.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fee6cceef0---fubolujaji.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/bbce7ac6fd2fdc14565e7a5d1bfed5bf/mifitevesamemuxamuto.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085fb65d005a---molevetiwularenes.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/leq8e57evr511lkijgloded6q5/55908909390.pdfIn PDF document text
    • https://combrooncom.com/contents//files/lodisogisebax.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/87276039861.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c61b270b805---kufufalizulumase.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/mozixefifojuxevuxagazokin.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607391d0d1650---guzipodixikusejonodogur.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/59388db37b115a0d9970536ad982c6aa/61261758903.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/4df28afdd59731799fd7a25abe849aa0/kaxaxusujowizodole.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/87128900220.pdfIn PDF document text
    • https://carlojans.com/cms/file/16554942727.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cb885ea98ef---18822487819.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/woruwitilaxuvejabizosalus.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/19859293222.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/epoujf0q0icnvdlsp61kji3hlq/famijusukurejemitagexuvo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=where+to+get+the+exp+share+in+pokemon+diamondPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE724 10980 bytes
SHA-256: eb8109be3fedfffae4abde1b880deeaa0f553be264080e65f4076717f1406199
font_01_sfnt_off00010056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10056 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11867 16252 bytes
SHA-256: bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4
font_03_sfnt_off00012e3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E3E 3916 bytes
SHA-256: 80abd934fa86c2b4f53d9455db6691c33412f92c82e7c6f495140460ac70d6c6
font_04_sfnt_off00013d47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D47 19368 bytes
SHA-256: ec1eb209a62b7cc8d9ead03211dced0d2c1320b2fbd37ce24bb95d90747aa3c7

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